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STANDARD TEST: WSP 230.2(05)
Standard Test Method for Superabsorbent Materials ― Polyacrylate Superabsorbent Powders ― Moisture Content ― Weight loss upon
Heating
The number in parenthes indicates the year of the last revision
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1. Scope
This test method originated from EDANA and covers the evaluation of mass loss upon heating for cros
s-linked Polyacrylate (PA) superabsorbent powders with a moisture content ranging between 0 and 5% by mass. The method is accurate to within + 0.1 %.天寒红叶稀
In general, this method is expected to be applicable to powdered polymeric superabsorbent materials that are free-flowing at temperatures between 15 and 150°C. Substances other than water, that are volatile in this temperature range, will interfere.
The SI values are regarded as the official standard system of measurement for this standard test method.
NOTE 1 SAFETY
This standard does not claim to address all of the safety concerns, if any, associated with its u. It is the responsibility of the ur of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to u. It is expected that the person performing this test has been fully trained in all aspects of this procedure.
2. Normative References
The following referenced documents are indispensable for the application of this document.
2.1 EDANA test methods
a) ERT 60.2-99 Standard Conditioning
b) ERT 430.2-02 Superabsorbent Materials – Polyacrylate Superabsorbent
Powders-Moisture Content-Weight Loss upon Heating
2.2 ISO test methods
a) ISO 17190-4:2001 Urine-absorbing aids for incontinence – Test methods for
characterizing polymer-bad absorbent materials – Part 4: Determination of Moisture Content by Mass Loss Upon Heating
b) ISO 5725-2 Accuracy (trueness and precision) of measurement methods and
results – Part 2: Basic Method for the Determination of the Repeatability and Reproducibility of a Standard Measurement Method
c) ISO 186: 1985
2.3 WSP test methods
WSP 1.0-04 Standard Terminology Relating to the Nonwoven Industry, EDANA’s and INDA’s Standard Test Methods
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3. Terms and Definitions
For the purpo of this document, the following terms and definitions apply:
3.1 Repeatability (r)
As determined by this test method is the variability found between the test results of randomly lect
ed homogenous specimens, tested at one laboratory, using one technician, one instrument, and one t of environmental conditions which were found on one given day
3.2 Reproducibility (R)
As determined by this test method is the variability found between the test results of randomly lected homogenous specimens, which were tested at different laboratories, using more than one technician at each laboratory, and tested over a two day period using standard laboratory environmental conditions which were found at each laboratory.
4. Principle
This procedure determines the mass loss upon dehydration of the test portion in an electrically heated drying oven, kept at (105 ± 2) °C at atmospheric pressure for a period of 3 hours.
5. Apparatus
5.1 Analytical balance415国家安全教育日
Capable of weighing, to the nearest 0.001 g, mass up to 300 g
5.2 Dish
Glass or aluminum, with corresponding removable lid, and with a bottom surface about 50 cm 2
5.3 Oven thermostat controlled
Capable of maintaining a temperature of (105 ± 2) °C
5.4 Desiccator
With active drying agent (e.g. silica gel)
5.5 Spatula
V-shaped, capable of holding about 1 g of PA superabsorbent powder
6. Sampling
NOTE 2 SAFETY WARNING
U respiratory protection, dust mask or fume hood, when handling sample amounts greater than 10 g
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6.1 In order to guarantee that a reprentative sample is taken
From the bulk material contained in a large bag or a silo truck, remove the top layer (approximately 20 cm). Take the test sample with a scoop. Place it in an airtight container of adequate size within 3 minutes after sampling.
6.2 Before taking a test portion
Out of the container to run the test, rotate the container three to five times so as to obtain a homogeneous product. Allow the container to sit 5 minutes before opening the lid and removing the test portion.
7. Procedure
7.1 Place a dish and lid
Into the oven at 105 °C for 3 hours While in the oven, remove the lid from the dish. At the end of this heating period, cover the dish with the lid and transfer the covered dish to the dessicator. Allow the covered dish to cool for 30 minutes to room temperature.
7.2 Weigh
To the nearest 0.001 g, the empty cover (top and bottom) dish and record this mass, in grams, as m 1
7.3 Remove the cover
With the help of a V-shaped spatula, add approximately 4.0 grams of a well-mixed reprentative test portion of PA superabsorbent powder test sample, free from lumps.
7.4 Replace the lid and weigh
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Weigh the clod dish containing the sample immediately to the nearest 0.001 g. Record this mass, in grams, as m 2
7.5 Distribute the test portion
strengthenIn a uniform particulate layer over the bottom of the dish, e.g. by using a spatula and gentle tapping
7.6 Place the open dish
With its corresponding lid, together in the oven at 105°C for 3 hours
7.7 After this 3 hour period
Immediately cover the dish with its lid before removing it from the oven. Then place it in the desiccator and allow it to cool for 30 minutes
7.8 When the covered dish
Containing the test portion has cooled to room temperature, remove it from the desiccator and weigh it immediately to the nearest 0.001 g. Record this mass, in grams, as m 3
7.9 Carry out at least two determinations
On the same well-mixed laboratory sample, simultaneously or successively, by the same analyst
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8. Calculation
8.1 Calculate the moisture
w m , expresd as a percentage, of the test sample using equation (1):
家常牛肉火锅Where:
m 1 is the mass, expresd in grams, of the dried empty, complete (top and bottom) dish (7.2)
m 2 is the mass, expresd in grams, of the complete dish with the test portion before drying (7.4)
m 3 is the mass, expresd in grams, of the complete dish with test portion after drying (7.8)
8.2 Calculate the average
Of the 2 replicate determinations
9. Report
In addition to the preci test results, the report shall include the following information:
a) Reference the test method ud
b) Complete identification of all materials tested and method of sampling
c) Name and address of testing institution
d) The type of polymer-bad absorbent materials, including all technical details
and source information required for complete identification of the sample
e) The results of moisture content by mass loss for each test portion (8.1)
expresd as mass fraction in percent to the nearest 0.1% and average for duplicate determinations
f) Make and model of testing equipment
母亲的抉择g) Laboratory testing conditions
h) Number of specimens tested
i) For computer procesd data, identify the software ud and the version
j) Deviation from the standard test procedure, if any
k) Whether or not samples were conditioned prior to testing and, if so, for how long l) Anything unusual noted during the testing
m ) Any unusual features noted during the determination or if the reproducibility
and/or repeatability criteria were not met
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傻子上学小品10. Precision
10.1 The data
For the repeatability (r) and reproducibility (R) of this test procedure were established by interlaboratory tests carried out in 1997 by EDANA, and are given in Annex A.
10.2 The absolute difference
Between two single test results obtained under repeatability test conditions in accordance with ISO 5725-2 shall not exceed the repeatability limit (r) in more than 5% of cas:
r = 0.40% moisture
10.3 The absolute difference
Between two single test results obtained under reproducibility test conditions in accordance with ISO 5725-2 shall not exceed the reproducibility limit (R) in more than 5% of cas:
R = 1.80% moisture
10.4 If the repeatability and reproducibility test criteria are not met
The test shall be repeated twice, each in duplicate, after ensuring that the original sample is thoroughly mixed. If the criteria are still not met, report the results as unusual, then diagno the source of error, for example by verifying correct operation of the instruments, and testing a portion of a material with a known value.
